RING EDITOR

To add points on a ring, point 
to the place where points are 
to be added with the cursor 
and hold the mouse key down.  
Drag the cursor over the area 
where the points are to be 
added.  Release the mouse key 
when finished.  Repeat as 
necessary.

To delete points, point to the 
beginning of points to be 
deleted, depress the mouse 
button and drag over the points 
to be deleted.  Release the 
mouse button when finished.  
Repeat as necessary.

Click on the finished button when you are done editing.